Safety device for elevators.



I Application filed December 1,-191118er'1s1No. 663,883.

To'all'whom'tit concern! and ExiNasrB;TIMM RMAN, citizens of the United States, and residents of thecity of chicagoycounty'bf Cook, and State ofIllinois, have invented certain new and useful Improvements in Safety Devices'for. Elevators, of which the following is a specification.

. ,Our invention rclates'to improvements in safetydevic'es for elevators and has for its object the production of a mechanism of this character which will beada ted, upon accidental'breaking of the hoisting cable to .be automatically operated ;to prevent. the descent 'offthe elevator car and hence possible injury tooccupants of the car.

A. further object is the reduction of a safety device as 'x'ne'ntioneti which will be so positive initsoperation, and efficient in use. Other objects will appearihereinafter."- With these objectsin viewour invention consists in the combinations and arrangements of parts hereinafter described. and claimed. I-

Our invention will be more readily understood by reference to the accompanying drawings formin a tion, andin whic I Figure 1 is a front elevation of an elevator construction to, which is applied "a safety mechanism embodying our invention, a portion of the car being broken away and shown in section in order to better illustrate 86 the construction, Fig. 2 is a top plan view of the construction shown in Fig. 1, and Fi 8 is an enlarged detail section taken on su stantially the line w-a: of Fig. 1.

The preferred form of construction as illustrated in the drawings comprises an elevator car consistin of the floor or latform 1 and the vertical side members 2, t is upper ends of the latter bein rigidly connected by cross beams 3 which are spaced apart with their extremities engaging the up er extremities of the side members 2. lbs side members 2 are of a channel form engagin. vertical guides 4 secured to the posts 5. T e elevator car is moved vertically by means of a hoisting cable 6, the bight or lowerend portion of said cable passing under the channel pulley? as is ordinarya The ulley 7 .is mounted between the: up- ;perfen ortionsjof straps8 which are mounted or ivertical slidin in guide loops 9 secured upon the outer sides of the cross part of this specifier min s-censors Ann. Finns set: n} mam ma, or cnroaeo, rumors.

' g.sssiemesisrsersass.

" assistants. ass. Patent. 1 Patented Oct. 15,1912.

g beams The upper end portions of the I Be 1 't known that we, Gimmes Censor:

straps 8 are bent into substantially rectangular form, as clearly shown in Fig. 3, to constitute bearings for the shaft 10 of the pulley 7.

Downward movement of the straps 8 is limited by contact of the upper downwardly turned ends of said straps which engage the upper edges of the cross beams 3, upward movement of said stra s being limited by the angularly forme inwardly turned lower ends thereof which are adapted to enage against the lower edges of said cross ams, metallic bearing plates 11 bein" preferably provided upon said edges of said plates at tie places of contact of the extremities of said straps therewith. The cross beams 3 are spaced apart suiiiciently to afford clearanceforthe lowerfend ortion of the pulley 7 when the straps 8 an hence said pulley are moved downwardly. Said s tra s 8' and hence the pulley 7 are normaliy held at their lower terminals ofmo vement bymeans of helical tension springs 12, the u per extremities of said springs engaging't erespe'ctive extremities of yokes 13 provided at the respective ends of shaft 10,

thelower extremities of said springs en- (1 hooks 14 rigaging outwardl projectin g he under sides of the cross ldly secured to t beams'3: This bein be in tension when t e straps 8 are at their 11 per terminals of movement and so that, w ien said straps are released, the same will be instantly moved downwardly b said springs. During the operation of tie elevator car then, in which event, the entire elevator car is sus ended from the pulley 7, the straps 8 wi be positioned at their upped terminals of movement, the car being suspended therefrom by engagement of the lower edges of the cross beams 3 with the inwardly turned ends of said straps, the springs 9 therefore, when the elevator car is in use, being in tension.

Arranged below the cross beams 3 is a pair of laterally projecting inclined bars 15, the inner ends of said bars being pivotally connected with the lower ends of the straps 8. This connection is effected referably through the medium of a be t 16 which connects said ends of said straps, the inner ends of the bars 15 being rotatably mounted upon a sleeve 17 which 18 provided upon the bolt 16 between the lower ends of the straps 8. A nut 16 threaded upon the so, the springs 12 will members 20f the elevator car-,; saidends of said bars being pointed. Theinher sides of the openings 18 are reinforced or protected by correspondingly" slotted plates19. The arrangement is sucl 1 ,that,';when the;

straps 8 are' at their'upper terminalsfof movement,;the outer ends of said bars will be positionedlin. the openings 18 out of en gement with .theguides e; Upon downwardjmoverne'nt of said straps8 the outer endsof thebars 15 will be moved laterally into engagement with said guides, as shown in dotted lines,,in,Fig. 1, toprevent downwardmovementof the elevator car. With this construction then it will be seen that iii theev'ent'ofthe hoisting cable of the elevator breaking, in which event' the straps 8 will be moved downwardly by means of the springs 12, .'as above described, the outer ends'of the bars 15 will be moved instantly into engagement with the guides 4 and thus serve to instantly check the fall of the'elevator 'car, thereby avoiding possible injury to property-andoccupants of the car.

' mechanisn'iloi --th'e'j character described is durable and]economicahfand the same is positive'a'nd of, high etiicienc in use.

I 'While we, have illustrate and described the preferred form of construction for carry.- ing our invention into effect, this is capable of variation and modification without 'deart-ing from .the spirit 'of the invention. I e, therefore, do not. wish to be limited to (topic: of this patent may-be obtained for the precise details of construction set'forth but desire to avail ourselves of such variations and modifications as comewithin the sco )0 of the appended claims.

Thriving-described our invention what we claim as new and desire to secure by Letters Patent is:

:1.,The combination of a car; vertically movable straps on said car; a shaft traversing the upper ends of said straps; a yoke secured toeach end of said shaft, springs interfiosed between said yokes and said car; a,pu e on said shaft between said straps;

tLl'lOlStlXlg cable passing under said pulley;

and, stop bars pivoted to the lower ends of said straps, substantially as described.

v2. The combination of a car having across beam at the top; vertically movable straps arranged onopposite sides of said beam; a

shaft traversing the upper ends of said CHARLES CARSON. "ERNEST B. TIMMERMAN.

\Vitnesses:

I'IELEN F. LILLIS, Josmza R. H. Po'rrs.

five cents each, by addressing the "Commissioner otlatents, Washington, D. O." 

